Header with curved pointed bottom

Question

I need to create the bluey/green area that is shown in the picture below. It has angled sides coming down to a point that has a slight curve.

What is the best way to achieve this using CSS? I need to support IE9+ or IE10+ if IE9 support is not possible.

I have started a basic demo here - (Don't need the content within the bluey-green area)

Answer 1

Here's my attempt with css only:

.header {
  background: #415d67;
  height: 150px;
  position: relative;
  z-index: 1;

}
.header:after {
    position: absolute;
    content: "";
    background: #415d67;
    width: 50%;
    bottom: -20px;
    right: 0;
    height: 100%;
    transform: skewY(-5deg);
    transform-origin: right;
    border-bottom-left-radius: 50px;
    padding-right: 44px;
    z-index: -1;
}
.header:before {
    position: absolute;
    content: "";
    background: #415d67;
    width: 50%;
    bottom: -20px;
    left: 0;
    height: 100%;
    transform: skewY(5deg);
    transform-origin: left;
    border-bottom-right-radius: 50px;
    padding-left: 44px;
    z-index: -1;
}
.content {
  background: white;
  padding: 20px;
  padding-top: 100px;
}

JSBIN demo

You can also consider using an svg graphic.

Answer 2

Another approach would be to use an inline svg. The following example uses a path element with a bezier curve command for the bottom curve :

#header {
  position: relative;
  padding: 30px;
  text-align: center;
  color: #fff;
}
#header svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

<div id="header">
  <svg viewbox="0 0 100 20" preserveAspectRatio="none">
    <path fill="#415D67" d="M0 0 H100 V10 L52.5 19.5 Q50 20 47.5 19.5 L0 10z" />
  </svg>
  <p>Some content</p>
</div>
<p>some more content</p>